Mill for grinding ores and other meterials.



W. H. JANNEY.

MILL FOR GRINDING ORES AND OTHER MATERIALS.

APPLICATION FILED MAY I. 1917.

l ,26 1 ,3 9a Patented Apr. 2, 1918' 2 SHEETS-SHEET 1.

W. H. JANNEY.

MILL FOR GRINDING ORES AND OTHER MATERIALS.

APPLICATION FILED MAY I, 1917.

m2 mm w .w m m 2 Q w 42M ZQWJQIW T 2 2W m w M um 7/ WILLIAM H. JANNEY, 0F HURLEY, NEW MEXICO.

MILL FOR GRINDING ORES AND OTHER MATERIALS.

Specification of Letters Patent.

Patented Apr. a, rare.

Application flleu May 1, 1917. Serial No. 165,665.

To all whom it may concern:

Be it known that I, WILLIAM H. JANNEY, a citizen of the United States, residing at Hurley, in the county of Grant and State of New Mexico, have invented a new and useful Mill for Grinding Ores and other Materials, of which the following is a specification.

This invention relates to a grinding mill of the so-called ball and drum type, in which the ore is ground by the action of balls or pebbles contained in a rotating drum or barrel through which the ore is caused to pass.

The main object of the present invention is to provide a grinding device of this character of large capacity or output for a given size, weight and cost of such apparatus.

A further object of the invention is to provide for effectively feeding both parts of such double grinding mill by a single feed ing device.

Another object of the invention is to provide a feeding device for the stated purpose, which will be capable of feeding the grinding balls or pebbles to the mill, as well as feeding the ore or material to be ground.

Another object of the invention is to provide, in a double mill construction, means for equalizing the action in the two parts of the mill. p

Another object of the invention is to provide in a mill of this type, feeding means adapted to feed or supply the material to the mill in such manner that such feeding device will not be clogged by back-flow from the mill.

The accompanying drawings illustrate an embodiment of my thereto:

Figure 1. is a tion of the mill.

Fig. 2. is a vertical section of the feed member.

Fig. 3. is a section on line 33 in Fig. 2.

My improved mill comprises two barrels 1 of any suitable shape; for example, either conical, as shown in the drawing, or cylindrical or tubular, and a feed member 2 in terposed between said barrels 1 and ri 'dly connected to same to form a unit rotatlvely mounted in the respective bearings 4 on standards 5, by trunnions 3 on the heads 9 and 10 of'the respective barrels.

Each of the barrels 1 may be provided with a manhole door 6 for permitting access partly sectional side elevainvention and referring to the interior thereof and may be provided with flanges 7 and 8 at its inner and outer ends respectively for connecting the barrel to the feed member 2 and to the head members 9 and 10 at the respective ends of the machine, and said barrels and heads may be provided with lining plates 10 and 11 respectively. Lining plates 11 for the heads are preferably provided with perforated portions or screens 12 through which the ground material may pass into and through the bore 3 of each trunnion 3. One of the heads, as 9, is provided with a driving means such as gear wheel 13. In other respects the barrels and heads for the two ends of the machine are of identical construction.

The feed member 2 constitutes a partition at the mid length of the for feeding material to both of the barrels, said feed member being adapted to feed material from a feed receptacle or trough 14 below the rotating body of the mill and to machine and serves convey such material to the center of the mill at or above the level of the material therein and to feed it alternately to the respective ends of the mill. For this purpose said feed means may be provided with two scoops 15 and 16, projecting outwardly beyond the barrels 1 and spiral Webs 17 and 18 extending between parallel diaphragm plates, walls, or partitions 19 and 20 which extend transversely to the axis of r0- tation of the mill and are provided with flanges 22, secured to flanges 7 of the barrels 1. The convolutions of the two spiral webs 17 and 18 form, in connection with such walls or partitions 19 and 20, spiral or volute passages 23 and 2 1, which are open at their outer ends at the scoops 15 and 16 and are open at their inner ends. through unobstructed openings 28 and 29, in the respective partitions 19 and 20, into the respective barrels 1 constituting the grinding chambers for the two ends of the machine. The inner portions of said spiral webs are united as indicated at 30, the adjacent portions 31 at opposite sides of the center of these webs being oppositely twisted or skewed so as to serve as deflecting means for forcing the material in the respective passages toward one end or the other of the machine as the case may be. Web means indicated at 32, extending between the par tition plates 19 and 20, form in connection with the webs 17 and 18, passages 34 and 35 which extend longitudinally of the matill chine, through the partition means, and into the respective grinding chambers at the two ends of the machine, so as to form an equalizing connection, whereby the amount of pulp and liquid in the respective ends of the machine will be automatically equalized. Suitable braces or ribs 36 may be provided for more rigidly connecting the spiral webs to the partition means.

At each end of the machine I prefer to provide a screen, indicated at 38, and consisting, for example, of a tubular perforate member attached to the trunnion 3 and open at each end so that the groundmaterial may pass therethrough from the bore 3 of said trunnion, and be discharged into a suitable launder or conduit 39 for conveying oversize material back to the feed receptacle trough 14. I may also provide a classifier 47, in position to receive the material passing through said screen and adapted to classify same, by hydraulic or other means, the finer material being conducted away by any suitable means and the oversize or coarse material being conducted by outlet 48 to the conduit 39 aforesaid, leadin to the feed trough 14,'so as to return all the oversize from the mill to the intake of the mill, for

regrinding.

The operation is as follows:

The rotative member of the mill, comprising the barrels'l, feed means 2, and the supporting trunnions therefor, is operated by the dr ving means 13 so as to rotate at suitable spced and the scoops of the feed means are thereby caused to project or dip into .the feed receptacle 1a and to take up material therefrom and in the rotation of said feed means said material is caused to pass inwardly in the spiral passages 23 and 24 and is discharged through the respective openings 28 and 29 into the two barrels 1. As the feed scoops take up the material alternately, the feed is alternately fed first to the one barrel and then to the other, so that each barrel is insured of approximately uniform feed, and any temporary inequalities that may exist in the amount of pulp present in the two barrels 1, are equalized by flow thro h the openings or passages 34 and 35, whlch extend through the partition means, so as to permit any,excess of pulp in either end of the machine to fiow into the other end portion. lhe grinding pebbles or balls may be fed into the machine in the same manner as the material to be ground, being introduced either into the scoops direct, or into the feed receptacle 15 and taken up by the scoops, and being conducted inwardly by the feed means and delivered to the respective barrels 1 near the axis of rotation. It will be understood that the axis of rotation of the machine will in general be slightly above the level of the pulp or matcrlal being ground in the barmenses rels, said level being near and somewhat below the axis of rotation of the mill, by reason of the overflow of ground material at the lower part of the outlets in the trunnions, so that the material and grinding balls delivered to the interior of the barrels by the feed means near the axis of rotation will pass out into the body of material already in the barrels, substantially at the upper level of the material therein, without liability of the material which is in the barrels flowing back into the feed means. Any material which has been ground sufliciently fine by the operation of t e balls or pebbles in the barrels, will find its way through the perforations in the screens 12 and through the trunnions 3 into the over-size screens 38, the over-size passing through the open outer end of each screen 38 into conduit or launder 39, whereby it is conducted back to the feed receptacle 14. Any material passing throu h the openings of screen 38, falls into t e classifier 47, wherein it is subjected to classifying action, the finer material passing off through outlet indicated at 48, and the coarse material returning through launder 39 to the feed receptacle 15, so that all oversize from the screen 38 and from the classifier 47 is returned to the mill circuit for regrinding. When the classifier 47 is used, the screen 38 serves the purpose of prevent ing the entrance into the classifier of material so coarse as to interfere with the proper operation of the classifier.

The mill above described constitutes a double or twin mill having large capacity for a given space occupied, and for 'ven power consumption. By this doub e or twin construction, considerable economies are effected in the cost of installation and operation as compared with two grinding units of the same total output.

An important feature of the mill, contributing to the large output and economical operation thereof, is the large screen capacity due to provision of screen means at each end, which enables rapid efiiux of finished pulp, with corresponding increase in the rate of supply of raw material, and also avoids the loss in grinding efiiciency due to retention in the null of material which has already been sufliciently ground.

What I claim is:

1. A grinding mill comprising two bearings, and a member rotatively mounted in sa1d bearings and comprising a barrel at each end, said barrels being se arated, and a feed means intermediate the arrels, said feed means having peripheral inlet means and provided with passage means opening into t he barrels near the axis of rotation thereof.

2. In a grindin mill, a rotatively"mounted member provi ed with two barrel portions, partition means between said barrel portions and provided with peripheral scoop means and with passages extending inwardly from said scoop means and opening respectively into said barrel portions' 3. A grinding mill comprising bearings, a feed receptacle, and a member rotatively mounted in said bearings and having two barrel portions and an intermediate feed means, said feed means being provided with scoop portions adapted to takeup material from said receptacle, and with passages adapted to conduct such material alternately to the two barrel portions.

4:. A grinding mill comprising bearings and a barrel member rotatively mounted on said bearings and having two barrel portions and an intermediate partition means, said partition means being provided with feed passages for feeding material alternately to the two barrel portions, and with a passage establishing communication between the two barrel ortions to equalize the amount of material t erein.

5. A grinding mill comprising a feed receptacle, two bearings, two barrels provided with trunnions mounted in the respective bearings, and with outlets for the ground material, said outlets being near the rotative axis of the mill and a feed means extending between the two barrels and rigidly connecting said barrels, said feed means being provided with scoop means projecting outwardly to take up material from said feed receptacle, and with passages extendin spirally inward from said scoop means, an opening respectively into the two barrels at points near the rotative axis of the mill so as to deliver the material to be groun at about the upper level of the material in the mill, the opening from said spiral passages into said barrels being unobstructed.

6. In a grinding mill, a rotative member comprising two barrels, and a feed member extending between said barrels and secured thereto, said feed member being provided with spiral passages extending inwardly from the peripheral portion thereof and opening respectively into the two barrels near the axis of rotation thereof.

7. In a grinding mill, a rotative member mounted to rotate on a horizontal axis and provided with two barrel portions and partition means extending between said barrel portions and rigidly connecting said barrel portions, said partition means being provided with feed passages extending inwardly from its peripheral portion and opening respectively into the said barrel portions, and with a passage establishing communication between the said barrel portions through said partition means, and said barrel portions having trunnions formed with outlet passages,-the openings from said feed passages into the barrel portions be 'ing unobstructed and being near the level of the material in said barrel portions as determined by the position of the said outlet passages.

In testimony whereof I have hereunto set my hand, at Hurley, Grant Co., New Mex, this 16th day of April, 1917.

WILLIAM H. J ANNEY. 

